Reactant(s) are the starting material/chemical to a reactiion
Product(s) are the final material/chemical at the end of a reaction.
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Reactants are substances that are consumed in a chemical reaction to produce new substances called products. Reactants are present at the beginning of a reaction, while products are formed as a result of the reaction. The reactants undergo chemical changes to form the products during the reaction process.
This depends on the reaction involved.
Reactant
product
Glucose is a reactant in cellular respiration. Carbon dioxide is a product of cellular respiration.
The limiting reactant is that reactant in a chemical reaction that will be used up first. Put another way, it is the reactant that is in the smallest supply. The way it controls the amount of product formed is that once it is used up, no more product can be formed, so the amount of product formed ultimately depends on the amount of the limiting reactant.